you don't say

you don't say

1. Is that true? (Can be used to express genuine surprise or interest, or else as a general response that doesn't express surprise or interest). A: "My wife's cousin is the starting quarterback for the New England Patriots." B: "You don't say! Have you ever met him?" A: "I found a frog in the river behind the house today, and I decided to keep it as a pet in my treehouse." B: "Hmm, you don't say. Don't bring it into the house."
2. Used as a sarcastic response to something one considers obvious or self-evident. A: "Wow, this place is expensive!" B: "Oh, you don't say. It's almost as if it's the only restaurant in the entire state with three Michelin stars or something."
See also: say
Farlex Dictionary of Idioms.

You don't say.

 
1. Inf. a general response to something that someone has said. (Expresses a little polite surprise or interest, but not disbelief.) Bill: I'm starting work on a new job next Monday. Bob: You don't say. Sally: The Jones boys are keeping a pet snake. Alice: You don't say.
2. . Inf. You have just said something that everybody already knows. Bill: I think I'm beginning to put on a little weight. Jane: You don't say. John: My goodness, prices are getting high. Sue: You don't say.
See also: say
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

you don't say

How surprising, is that true? Also, I find that hard to believe. For example, I've been working on this project for two years.-You don't say, or The man who runs this soup kitchen is a real saint.-You don't say! This expression, a shortening of you don't say so, may be used straightforwardly or ironically. [Late 1800s]
See also: say
The American Heritage® Dictionary of Idioms by Christine Ammer.

you don’t ˈsay!

(spoken, often ironic) used to express surprise: ‘My brother’s an astronaut, you know.’ ‘You don’t say!’ ‘I was in the Scouts for six years.’ ‘You don’t say.’ (= I’m not interested/surprised).
Farlex Partner Idioms Dictionary
See also:
  • you don't say!
  • kissing cousin
  • kissing cousins
  • Deflategate
  • take (one's) side
  • take part
  • take somebody's part
  • take someone's part
  • take (one's) part
  • fall on hard times
References in periodicals archive
"You don't say, `Those Bosnian soldiers are looking mighty fine in their fatigues.'" Mind you, Price didn't work out on the CNN-like competitor because higher-ups said he was "too camp." "I wasn't wearing a feather boa or anything," he says.
Beyond QAF: from news to sitcoms, out gays & lesbians are making their mark all over British TV
You don't say if you've told anyone else about the abuse or if you've had counselling, which would help so much.
Shall I tell partner I was abused as a child?
You don't say if your uncle was ever prosecuted for abusing you, but it's never too late to seek justice.
SHOULD I TELL HIM I WAS ABUSED? DEAR COLEEN; Ireland's most straight-talking problem page
You don't say what his reasons are for being tired all the time - if he has an exhausting job, for example, then there's an obvious reason for it and you need to try to think of practical ways to resolve it.
I ARGUE WITH HIM BECAUSE HE'S SO TIRED ALL THE TIME; DEAR COLEEN; The UK's most straight-talking problem page
You don't say if either of you is on medication or having counselling but it would be worth him seeing his doctor again and explaining how he's feeling.
Always rowing because he's so tired
YOU don't say how long your stepfather has been around but I know from personal experience how tough it can be for everyone involved to find their place in a stepfamily.
Stepfather has kicked me out
NAME the artist and song and you could win a prize: It's amazing how you can speak right to my heart Without saying a word you can light up the dark Try as I may I can never explain What I hear when you don't say a thing The smile on your face lets me know that you need me There's a truth in your eyes saying you'll never leave me Entries to Rick Fulton, Daily Record, One Central Quay, Glasgow G3 8DA.
The Razz: Sing for your supper
You don't say how long your stepfather has been around, but I know from personal experience how tough it can be for everyone involved to find their place in a stepfamily.
STEPFATHER HAS KICKED ME OUT
You don't say much about that, but then again I suppose I am just another moaning United supporter from down South.
[2] SPORTS LETTER: DO MAN UTD INTIMIDATE REFEREES? - NO